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Finding the Fourth Proportional to 18,992.80, 28,512.60 and 11,972.80

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Solution

The fourth proportional to 18,992.80, 28,512.60 and 11,972.80 is: 17,973.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,992.80 : 28,512.60 = 11,972.80 : x
  2. Step 2: Convert to fraction form
    18,992.80/28,512.60 = 11,972.80/x
  3. Step 3: Cross multiply
    18,992.80x = 28,512.60 × 11,972.80
  4. Step 4: Simplify right side
    18,992.80x = 341,375,657.28
  5. Step 5: Solve for x
    x = 341,375,657.28/18,992.80
  6. Step 6: Final answer
    x = 17,973.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.